Southern Ontario is a
primary region of the Canadian
province
A province is an administrative division within a country or sovereign state, state. The term derives from the ancient Roman , which was the major territorial and administrative unit of the Roman Empire, Roman Empire's territorial possessions ou ...
of
Ontario
Ontario is the southernmost Provinces and territories of Canada, province of Canada. Located in Central Canada, Ontario is the Population of Canada by province and territory, country's most populous province. As of the 2021 Canadian census, it ...
. It is the most densely populated and southernmost region in Canada, with approximately 13.5 million people, approximately 36% of Canada's population of 37 million. The region lies south of the province's other primary region,
Northern Ontario
Northern Ontario is a primary geographic and quasi-administrative region of the Provinces and territories of Canada, Canadian province of Ontario, the other primary region being Southern Ontario. Most of the core geographic region is located on p ...
, although the exact northern boundary of Southern Ontario is disputed. However, its core region is situated south of
Algonquin Park, the latter being in an area of transition between
coniferous forest north of the
French and
Mattawa Rivers and southern
deciduous forest
In the fields of horticulture and botany, the term deciduous () means "falling off at maturity" and "tending to fall off", in reference to trees and shrubs that seasonally shed leaves, usually in the autumn; to the shedding of petals, after flo ...
. It covers between 14 and 15% of the province, depending on the inclusion of the
Parry Sound and
Muskoka districts which also lie in the transitional area between northern and southern forest regions.
Southern Ontario differs greatly from
Northern Ontario
Northern Ontario is a primary geographic and quasi-administrative region of the Provinces and territories of Canada, Canadian province of Ontario, the other primary region being Southern Ontario. Most of the core geographic region is located on p ...
, having a much higher population density, a different climate, and a different culture than its northern counterpart. It is broken into smaller subregions, including
Central Ontario,
Eastern Ontario, the
Golden Horseshoe, and
Southwestern Ontario.
The core area of Southern Ontario is part of the
Quebec City–Windsor Corridor, which extends northeast into southern
Quebec
Quebec is Canada's List of Canadian provinces and territories by area, largest province by area. Located in Central Canada, the province shares borders with the provinces of Ontario to the west, Newfoundland and Labrador to the northeast, ...
. The transitional northern area of this primary region extends north to the Mattawa River and occupies part of the
Grenville Geological Province of the
Canadian Shield
The Canadian Shield ( ), also called the Laurentian Shield or the Laurentian Plateau, is a geologic shield, a large area of exposed Precambrian igneous and high-grade metamorphic rocks. It forms the North American Craton (or Laurentia), th ...
, which also extends northeast into southern Quebec; most of Northern Ontario lies within the
Superior Geological Province.
Identity
Southern Ontario can be distinguished from Northern Ontario because it is far more densely populated and contains most of the province's cities, major roads, and institutions. Northern Ontario, in contrast, contains more natural resources and remote wilderness. Although it has no saltwater coastline, the region has an abundance of freshwater coastlines on three
Great Lakes
The Great Lakes, also called the Great Lakes of North America, are a series of large interconnected freshwater lakes spanning the Canada–United States border. The five lakes are Lake Superior, Superior, Lake Michigan, Michigan, Lake Huron, H ...
(
Huron,
Erie and
Ontario
Ontario is the southernmost Provinces and territories of Canada, province of Canada. Located in Central Canada, Ontario is the Population of Canada by province and territory, country's most populous province. As of the 2021 Canadian census, it ...
), as well as smaller lakes such as
Lake Simcoe
Lake Simcoe is a lake in southern Ontario, Canada, the fourth-largest lake wholly within the province, after Lake Nipigon, Lac Seul, and Lake Nipissing. At the time of the first European contact in the 17th century, the lake was called ''Ouentir ...
and
Lake St. Clair. It is a major
vineyard
A vineyard ( , ) is a plantation of grape-bearing vines. Many vineyards exist for winemaking; others for the production of raisins, table grapes, and non-alcoholic grape juice. The science, practice and study of vineyard production is kno ...
region and producer of
Canadian wines.
While Southern Ontario has been a part of the province of Ontario since its establishment at
Confederation
A confederation (also known as a confederacy or league) is a political union of sovereign states united for purposes of common action. Usually created by a treaty, confederations of states tend to be established for dealing with critical issu ...
in 1867, previously forming the colony of Upper Canada, a large portion of Northern Ontario did not become part of Ontario until 1912.
History

The French explored and colonized Territorial Southern Ontario in the 17th century and forged relations with the
Wyandot ''Huron'' people, based around the Georgian Bay/Lake Simcoe area. Other
Iroquoian speaking people to the south were the
Petun and
Neutral Nation, and further northeast,
Algonquins inhabited the upper Ottawa River/Madawaska Valley areas and the
Mississaugas moved south from northern Lake Huron, settling lands in both the
Kawartha region and just west of Toronto.
Following the
Seven Years' War
The Seven Years' War, 1756 to 1763, was a Great Power conflict fought primarily in Europe, with significant subsidiary campaigns in North America and South Asia. The protagonists were Kingdom of Great Britain, Great Britain and Kingdom of Prus ...
, the British wrested control of Southern Ontario, and more significant colonization efforts were spurred on by the arrival of
United Empire Loyalist
United Empire Loyalist (UEL; or simply Loyalist) is an honorific title which was first given by the 1st Lord Dorchester, the governor of Quebec and governor general of the Canadas, to American Loyalists who resettled in British North Ameri ...
s brought on by the
American Revolution
The American Revolution (1765–1783) was a colonial rebellion and war of independence in which the Thirteen Colonies broke from British America, British rule to form the United States of America. The revolution culminated in the American ...
.
Southern Ontario was where a large portion of the battles took place during the
War of 1812
The War of 1812 was fought by the United States and its allies against the United Kingdom of Great Britain and Ireland, United Kingdom and its allies in North America. It began when the United States United States declaration of war on the Uni ...
, and was a major destination for escaping slaves using the
Underground Railroad.
Following the enactment of
Prohibition in the United States
The Prohibition era was the period from 1920 to 1933 when the United States prohibited the production, importation, transportation, and sale of alcoholic beverages. The alcohol industry was curtailed by a succession of state legislatures, an ...
in 1919, Southern Ontario immediately became a hotbed of smuggling alcohol ''(spirit)'' across the border.
Demographics
Southern Ontario is home to over 94%, or 12.1 million, of Ontario's total population of 12.9 million (and about 35% of Canada's total population), compared to approximately 750,000 in Northern Ontario. This is due to many factors, including the more arable land in the south, its more moderate climate, well-used transportation (water, land, and air) routes, as well as a long history of early European
settlers
A settler or a colonist is a person who establishes or joins a permanent presence that is separate to existing communities. The entity that a settler establishes is a Human settlement, settlement. A settler is called a pioneer if they are among ...
and
colonialism
Colonialism is the control of another territory, natural resources and people by a foreign group. Colonizers control the political and tribal power of the colonised territory. While frequently an Imperialism, imperialist project, colonialism c ...
.
For thousands of years, Ontario has been home to
indigenous aboriginal communities, with numerous nations with differing languages at the time of European contact. Over 200,000 aboriginal Canadians live in Southern Ontario today.
Southern Ontario was colonized by the
French and the
British
British may refer to:
Peoples, culture, and language
* British people, nationals or natives of the United Kingdom, British Overseas Territories and Crown Dependencies.
* British national identity, the characteristics of British people and culture ...
. After the area began to be developed for European settlement, especially after the American Revolutionary War, other
European immigrants arrived as well, with increased immigration in the late 19th and early 20th centuries. Since the late 20th century, many immigrants have come from Asia and other parts of the world. The region is one of the top destinations for immigrants worldwide, particularly the
Greater Toronto Area
The Greater Toronto Area, commonly referred to as the GTA, includes the Toronto, City of Toronto and the regional municipality, regional municipalities of Regional Municipality of Durham, Durham, Regional Municipality of Halton, Halton, Regional ...
.
Economy
The area has a large manufacturing sector. Since the mid-2000s, Ontario has produced more vehicles per year than the state of
Michigan
Michigan ( ) is a peninsular U.S. state, state in the Great Lakes region, Great Lakes region of the Upper Midwest, Upper Midwestern United States. It shares water and land boundaries with Minnesota to the northwest, Wisconsin to the west, ...
. In a cross-border definition, a swath of Southern Ontario could be considered a part of the
Rust Belt
The Rust Belt, formerly the Steel Belt or Factory Belt, is an area of the United States that underwent substantial Deindustrialization, industrial decline in the late 20th century. The region is centered in the Great Lakes and Mid-Atlantic (Uni ...
. Factory closings because of industry restructuring and globalization (corresponding movement of jobs overseas and to non-unionized labour markets in the United States) have for the past few decades taken their toll. This is most evident in the region's southern tier cities, which have large automobile or associated industrial bases, such as
Windsor,
London
London is the Capital city, capital and List of urban areas in the United Kingdom, largest city of both England and the United Kingdom, with a population of in . London metropolitan area, Its wider metropolitan area is the largest in Wester ...
,
St. Thomas and
St. Catharines. Still affected by these factors, but to a lesser extent, is
Hamilton
Hamilton may refer to:
* Alexander Hamilton (1755/1757–1804), first U.S. Secretary of the Treasury and one of the Founding Fathers of the United States
* ''Hamilton'' (musical), a 2015 Broadway musical by Lin-Manuel Miranda
** ''Hamilton'' (al ...
, the centre of steel production, and
Sarnia
Sarnia is a city in Lambton County, Ontario, Canada. It had a Canada 2021 Census, 2021 population of 72,047, and is the largest city on Lake Huron. Sarnia is located on the eastern bank of the junction between the Upper and Lower Great Lakes, ...
, the centre of petrochemical production. The province's two largest cities, Toronto and Ottawa, have moved increasingly to a service and knowledge economy. Toronto is home to the country's financial sector, including the
major Canadian banks and
Toronto Stock Exchange
The Toronto Stock Exchange (TSX; ) is a stock exchange located in Toronto, Ontario, Canada. It is the List of stock exchanges, 10th largest exchange in the world and the third largest in North America based on market capitalization. Based in th ...
. Ottawa, the national capital, is home to the
Government of Canada
The Government of Canada (), formally His Majesty's Government (), is the body responsible for the federation, federal administration of Canada. The term ''Government of Canada'' refers specifically to the executive, which includes Minister of t ...
and most government
departments and agencies, in addition to having a strong technology sector.
Some parts of Southern Ontario are heavily entwined with bordering cities in
New York and Michigan in terms of industry and people. The focus areas are the
Buffalo–Niagara,
Sarnia
Sarnia is a city in Lambton County, Ontario, Canada. It had a Canada 2021 Census, 2021 population of 72,047, and is the largest city on Lake Huron. Sarnia is located on the eastern bank of the junction between the Upper and Lower Great Lakes, ...
and
Detroit–Windsor. Many people work and live on opposite sides of the border. The
NEXUS program for frequent travelers across the border is increasing in popularity among bordering communities. Other areas with heavy trade traffic with Southern Ontario include
Montreal
Montreal is the List of towns in Quebec, largest city in the Provinces and territories of Canada, province of Quebec, the List of the largest municipalities in Canada by population, second-largest in Canada, and the List of North American cit ...
and the province of
Quebec
Quebec is Canada's List of Canadian provinces and territories by area, largest province by area. Located in Central Canada, the province shares borders with the provinces of Ontario to the west, Newfoundland and Labrador to the northeast, ...
, parts of northern
Ohio
Ohio ( ) is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. It borders Lake Erie to the north, Pennsylvania to the east, West Virginia to the southeast, Kentucky to the southwest, Indiana to the ...
, and western
Pennsylvania
Pennsylvania, officially the Commonwealth of Pennsylvania, is a U.S. state, state spanning the Mid-Atlantic (United States), Mid-Atlantic, Northeastern United States, Northeastern, Appalachian, and Great Lakes region, Great Lakes regions o ...
.
Most of the province's agriculture is found here. That includes most of Ontario's berry growers, who are represented by .
Tourism
Southern Ontario is well known for its attractions and tourism. Some popular tourist attractions include the
CN Tower
The CN Tower () is a communications and observation tower in Toronto, Ontario, Canada. Completed in 1976, it is located in downtown Toronto, built on the former Railway Lands. Its name "CN" referred to Canadian National, the railway co ...
,
Parliament Hill
Parliament Hill (), colloquially known as The Hill, is an area of Crown land on the southern bank of the Ottawa River that houses the Parliament of Canada in downtown Ottawa, Ontario. It accommodates a suite of Gothic revival buildings whose ...
,
Niagara Falls
Niagara Falls is a group of three waterfalls at the southern end of Niagara Gorge, spanning the Canada–United States border, border between the Provinces and territories of Canada, province of Ontario in Canada and the state of New York (s ...
,
National Gallery of Canada
The National Gallery of Canada (), located in the capital city of Ottawa, Ontario, is Canada's National museums of Canada, national art museum. The museum's building takes up , with of space used for exhibiting art. It is one of the List of large ...
,
Canada's Wonderland
Canada's Wonderland, formerly known as Paramount Canada's Wonderland, is a amusement park located in Vaughan, Ontario, a municipality within the Greater Toronto Area. Opened in 1981 by the Taft Broadcasting, Taft Broadcasting Company and the Gr ...
,
CNE,
Caesars Windsor,
Canadian War Museum
The Canadian War Museum (CWM) () is a National museums of Canada, national museum on the military history of Canada, country's military history in Ottawa, Ontario, Canada. The museum serves as both an educational facility on Canadian military hist ...
,
Toronto Zoo,
Hockey Hall of Fame
The Hockey Hall of Fame () is a museum and hall of fame located in Toronto, Ontario, Canada. Dedicated to the history of ice hockey, it holds exhibits about players, teams, National Hockey League (NHL) records, memorabilia and National Hockey Le ...
,
Ripley's Aquarium of Canada,
Royal Canadian Mint,
Marineland,
The Rideau Canal, the
Canadian Museum of History
The Canadian Museum of History () is a national museum on anthropology, Canadian history, cultural studies, and ethnology in Gatineau, Quebec, Canada. The purpose of the museum is to promote the heritage of Canada, as well as support related res ...
and the
Royal Ontario Museum
The Royal Ontario Museum (ROM) is a museum of art, world culture and natural history in Toronto, Ontario, Canada. It is one of the largest museums in North America and the largest in Canada. It attracts more than one million visitors every year ...
.
Niagara Falls
Niagara Falls is a group of three waterfalls at the southern end of Niagara Gorge, spanning the Canada–United States border, border between the Provinces and territories of Canada, province of Ontario in Canada and the state of New York (s ...
is the 6th most visited attraction by domestic and international tourists worldwide, with over 14 million tourists annually. In 2006,
Toronto
Toronto ( , locally pronounced or ) is the List of the largest municipalities in Canada by population, most populous city in Canada. It is the capital city of the Provinces and territories of Canada, Canadian province of Ontario. With a p ...
was the 14th most visited city by international tourists in the world, with over 4.1 million visitors in the year.
Ottawa
Ottawa is the capital city of Canada. It is located in the southern Ontario, southern portion of the province of Ontario, at the confluence of the Ottawa River and the Rideau River. Ottawa borders Gatineau, Gatineau, Quebec, and forms the cor ...
is the most visited city in Canada by domestic tourists, hosting over 6.9 million Canadian visitors per year.
Southern Ontario is home to several professional sports teams, including the
Ottawa Senators and
Toronto Maple Leafs
The Toronto Maple Leafs (officially the Toronto Maple Leaf Hockey Club and often referred to as the Leafs) are a professional ice hockey team based in Toronto. The Maple Leafs compete in the National Hockey League (NHL) as a member of the A ...
in the
NHL
The National Hockey League (NHL; , ''LNH'') is a professional ice hockey league in North America composed of 32 teams25 in the United States and 7 in Canada. The NHL is one of the major professional sports leagues in the United States and Cana ...
; the
Toronto Blue Jays
The Toronto Blue Jays are a Canadian professional baseball team based in Toronto. The Blue Jays compete in Major League Baseball (MLB) as a member club of the American League (AL) American League East, East Division. Since 1989, the team has p ...
in
Major League Baseball
Major League Baseball (MLB) is a professional baseball league composed of 30 teams, divided equally between the National League (baseball), National League (NL) and the American League (AL), with 29 in the United States and 1 in Canada. MLB i ...
; the
NBA's Toronto Raptors
The Toronto Raptors are a Canadian professional basketball team based in Toronto. The Raptors compete in the National Basketball Association (NBA) as a member of the Atlantic Division (NBA), Atlantic Division of the Eastern Conference (NBA), E ...
; soccer's
Toronto FC
Toronto Football Club is a Canadian professional Association football, soccer club based in Toronto. The club competes in Major League Soccer (MLS) as a member of the Eastern Conference (MLS), Eastern Conference. The team plays its home matc ...
in
MLS and
Atlético Ottawa in the
Canadian Premier League
The Canadian Premier League (CPL or CanPL; ) is a professional Association football, soccer league in Canada and the highest level of the Canadian soccer league system. The league comprises eight teams, from five of provinces and territories of ...
; and three teams in the
Canadian Football League
The Canadian Football League (CFL; , LCF) is a Professional gridiron football, professional Canadian football league in Canada. It comprises nine teams divided into two divisions, with four teams in the East Division (CFL), East Division and f ...
—the
Hamilton Tiger-Cats
The Hamilton Tiger-Cats are a professional Canadian football team based in Hamilton, Ontario, Canada. They are currently members of the East Division (CFL), East Division of the Canadian Football League (CFL). The Tiger-Cats play their home game ...
,
Ottawa Redblacks, and
Toronto Argonauts
The Toronto Argonauts (officially the Toronto Argonaut Football Club and colloquially known as the Argos) are a professional Canadian football team based in Toronto, Ontario. The Argonauts compete in the East Division (CFL), East Division of t ...
. The region also hosts the
Canadian Open in golf and
Rogers Cup in tennis.
The area sponsors many internationally renowned festivals and events, including
Toronto International Film Festival
The Toronto International Film Festival (TIFF, often stylized as tiff) is one of the most prestigious and largest publicly attended film festivals in the world. Founded in 1976, the festival takes place every year in early September. The organi ...
,
Winterlude,
Caribana
The Toronto Caribbean Carnival, formerly and affectionately known as Caribana, is a festival of Caribbean culture and traditions held each summer in the city of Toronto, Ontario, Canada. It is a pan-Caribbean Carnival event and has been billed ...
,
Bluesfest,
Pride Week,
Kitchener Oktoberfest,
Havelock Jamboree,
Toronto Indy,
Sarnia Bayfest,
Canada Day
Canada Day, formerly known as Dominion Day, is the national day of Canada. A Public holidays in Canada, federal statutory holiday, it celebrates the anniversary of Canadian Confederation which occurred on July 1, 1867, with the passing of the B ...
in Ottawa,
International Freedom Festival in
Windsor,
Stratford Festival,
Shaw Festival
The Shaw Festival is a Charitable organization, Charitable theatre festival in Niagara-on-the-Lake, Ontario, Niagara-on-the-Lake, Ontario, Canada. It is the second largest repertory theatre company in North America, second only to Canada's Strat ...
and
Virgin Festival
The Virgin Fest, known as the Virgin Mobile FreeFest in the United States, was a rock festival held in the United States and Canada, a spin-off from the V Festival held in the UK. In North America the Virgin Group, Virgin name, and more recently ...
.
Several large legal gambling establishments have been built throughout the Province, with
Caesars Windsor and
Fallsview Casino being the two flagship casinos. In addition to casinos, Ontario has many legal
horseracing facilities with
slot machines. Racetrack slots are located throughout the Province. All gaming in the Province is overseen by the
Ontario Lottery and Gaming Corporation (OLG), and the
Alcohol and Gaming Commission of Ontario.
Southern Ontario has many natural attractions.
Wasaga Beach,
Grand Bend,
Sauble Beach, and
Sandbanks are beaches along the
Great Lakes
The Great Lakes, also called the Great Lakes of North America, are a series of large interconnected freshwater lakes spanning the Canada–United States border. The five lakes are Lake Superior, Superior, Lake Michigan, Michigan, Lake Huron, H ...
. The
Niagara Escarpment offers hiking, skiing, and hundreds of waterfalls, including
Niagara Falls
Niagara Falls is a group of three waterfalls at the southern end of Niagara Gorge, spanning the Canada–United States border, border between the Provinces and territories of Canada, province of Ontario in Canada and the state of New York (s ...
. The
Ottawa River
The Ottawa River (, ) is a river in the Canadian provinces of Ontario and Quebec. It is named after the Algonquin word "to trade", as it was the major trade route of Eastern Canada at the time. For most of its length, it defines the border betw ...
has white-water rafting which attracts
rafters and
kayakers from all over the world.
Ontario Parks governs all provincial parks, and
Parks Canada
Parks Canada ()Parks Canada is the applied title under the Federal Identity Program; the legal title is Parks Canada Agency (). is the agency of the Government of Canada which manages the country's 37 National Parks, three National Marine Co ...
governs all
national parks
A national park is a nature park designated for conservation (ethic), conservation purposes because of unparalleled national natural, historic, or cultural significance. It is an area of natural, semi-natural, or developed land that is protecte ...
.
Cities
Southern Ontario is home to both Canada's capital city (Ottawa), and Canada's largest city (Toronto).
Southern Ontario communities have 13 telephone
area codes
A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. Telephone numbers are the addresses of participants in a telephone network, reach ...
: 226, 249, 289, 343, 365, 382, 416, 437, 519, 548, 613, 647, 705, and 905.
Statistics Canada's measure of a "metro area", the
Census Metropolitan Area
The census geographic units of Canada are the census subdivisions defined and used by Canada's federal government statistics bureau Statistics Canada to conduct the country's quinquennial census. These areas exist solely for the purposes of stat ...
(CMA), roughly bundles together population figures from the core municipality with those from "commuter" municipalities. Note: A city's
metropolitan area
A metropolitan area or metro is a region consisting of a densely populated urban area, urban agglomeration and its surrounding territories which share Industry (economics), industries, commercial areas, Transport infrastructure, transport network ...
may actually be larger than its CMA. For example;
Oshawa
Oshawa is a city in Ontario, Canada, on the Lake Ontario shoreline. It lies in Southern Ontario, approximately east of downtown Toronto. It is commonly viewed as the eastern anchor of the Greater Toronto Area and of the Golden Horseshoe. It ...
is part of the
Greater Toronto Area
The Greater Toronto Area, commonly referred to as the GTA, includes the Toronto, City of Toronto and the regional municipality, regional municipalities of Regional Municipality of Durham, Durham, Regional Municipality of Halton, Halton, Regional ...
; however, it is considered its own CMA.
Census divisions
The region is broken up into 40
census division
Census divisions, in Canada and the United States, are areas delineated for the purposes of statistical analysis and presentation; they have no government in and of themselves. The census divisions of Canada are second-level census geographic uni ...
s, including 22
counties
A county () is a geographic region of a country used for administrative or other purposesL. Brookes (ed.) '' Chambers Dictionary''. Edinburgh: Chambers Harrap Publishers Ltd, 2005. in some nations. The term is derived from the Old French denoti ...
, eight
regional municipalities, nine
single-tier municipalities and depending on its inclusion, one
district
A district is a type of administrative division that in some countries is managed by the local government. Across the world, areas known as "districts" vary greatly in size, spanning regions or county, counties, several municipality, municip ...
. The line between the counties and regions of the south and the districts of the north can be considered a boundary between Southern and Northern Ontario.
This is disputed, however, as the demarcation line that is referenced in provincial documents is the Nipissing Passageway, originally an
Indian trail between Georgian Bay and the
Ottawa River
The Ottawa River (, ) is a river in the Canadian provinces of Ontario and Quebec. It is named after the Algonquin word "to trade", as it was the major trade route of Eastern Canada at the time. For most of its length, it defines the border betw ...
. The trail follows the
French River from
Georgian Bay to
Lake Nipissing
Lake Nipissing (; , ) is a lake in the Provinces and territories of Canada, Canadian province of Ontario. It has a surface area of , a mean elevation of above sea level, and is located between the Ottawa River and Georgian Bay. Lake Nipissing i ...
. At
North Bay, of land separates Lake Nipissing from Trout Lake. From Trout Lake, the trail follows the
Mattawa River to the
Ottawa River
The Ottawa River (, ) is a river in the Canadian provinces of Ontario and Quebec. It is named after the Algonquin word "to trade", as it was the major trade route of Eastern Canada at the time. For most of its length, it defines the border betw ...
.
*
Brant (144,771)
*
Bruce (73,396)
*
Chatham–Kent (104,316)
*
Dufferin (66,257)
*
Durham (696,992)
*
Elgin (94,752)
*
Essex
Essex ( ) is a Ceremonial counties of England, ceremonial county in the East of England, and one of the home counties. It is bordered by Cambridgeshire and Suffolk to the north, the North Sea to the east, Kent across the Thames Estuary to the ...
(422,860)
*
Frontenac (161,780)
*
Grey
Grey (more frequent in British English) or gray (more frequent in American English) is an intermediate color between black and white. It is a neutral or achromatic color, meaning that it has no chroma. It is the color of a cloud-covered s ...
(100,905)
*
Haldimand-
Norfolk
Norfolk ( ) is a Ceremonial counties of England, ceremonial county in England, located in East Anglia and officially part of the East of England region. It borders Lincolnshire and The Wash to the north-west, the North Sea to the north and eas ...
(116,872)
*
Haliburton (20,571)
*
Halton (596,637)
*
Hamilton
Hamilton may refer to:
* Alexander Hamilton (1755/1757–1804), first U.S. Secretary of the Treasury and one of the Founding Fathers of the United States
* ''Hamilton'' (musical), a 2015 Broadway musical by Lin-Manuel Miranda
** ''Hamilton'' (al ...
(569,353)
*
Hastings
Hastings ( ) is a seaside town and Borough status in the United Kingdom, borough in East Sussex on the south coast of England,
east of Lewes and south east of London. The town gives its name to the Battle of Hastings, which took place to th ...
(145,746)
*
Huron (61,366)
*
Kawartha Lakes (79,247)
*
Lambton (128,154)
*
Lanark
Lanark ( ; ; ) is a town in South Lanarkshire, Scotland, located 20 kilometres to the south-east of Hamilton, South Lanarkshire, Hamilton. The town lies on the River Clyde, at its confluence with Mouse Water. In 2016, the town had a populatio ...
(75,760)
*
Leeds & Grenville (104,070)
*
Lennox & Addington (45,182)
*
Middlesex
Middlesex (; abbreviation: Middx) is a Historic counties of England, former county in South East England, now mainly within Greater London. Its boundaries largely followed three rivers: the River Thames, Thames in the south, the River Lea, Le ...
(500,563)
*
Muskoka1 (66,674)
*
Niagara (477,941)
*
Northumberland
Northumberland ( ) is a ceremonial counties of England, ceremonial county in North East England, on the Anglo-Scottish border, border with Scotland. It is bordered by the North Sea to the east, Tyne and Wear and County Durham to the south, Cumb ...
(89,365)
*
Ottawa
Ottawa is the capital city of Canada. It is located in the southern Ontario, southern portion of the province of Ontario, at the confluence of the Ottawa River and the Rideau River. Ottawa borders Gatineau, Gatineau, Quebec, and forms the cor ...
(1,017,449)
*
Oxford
Oxford () is a City status in the United Kingdom, cathedral city and non-metropolitan district in Oxfordshire, England, of which it is the county town.
The city is home to the University of Oxford, the List of oldest universities in continuou ...
(121,781)
*
Parry Sound1 (46,909)
*
Peel (1,451,022)
*
Perth
Perth () is the list of Australian capital cities, capital city of Western Australia. It is the list of cities in Australia by population, fourth-most-populous city in Australia, with a population of over 2.3 million within Greater Perth . The ...
(81,565)
*
Peterborough
Peterborough ( ) is a City status in the United Kingdom, cathedral city in the City of Peterborough district in the Ceremonial counties of England, ceremonial county of Cambridgeshire, England. The city is north of London, on the River Nene. A ...
(147,681)
*
Prescott and Russell (95,639)
*
Prince Edward (25,704)
*
Renfrew (102,394)
*
Simcoe (533,169)
*
Stormont, Dundas and Glengary (114,637)
*
Toronto
Toronto ( , locally pronounced or ) is the List of the largest municipalities in Canada by population, most populous city in Canada. It is the capital city of the Provinces and territories of Canada, Canadian province of Ontario. With a p ...
(2,794,356)
*
Waterloo (587,165)
*
Wellington
Wellington is the capital city of New Zealand. It is located at the south-western tip of the North Island, between Cook Strait and the Remutaka Range. Wellington is the third-largest city in New Zealand (second largest in the North Island ...
(241,026)
*
York
York is a cathedral city in North Yorkshire, England, with Roman Britain, Roman origins, sited at the confluence of the rivers River Ouse, Yorkshire, Ouse and River Foss, Foss. It has many historic buildings and other structures, such as a Yor ...
(1,173,334)
1 Muskoka and Parry Sound are commonly regarded as transitional regions between Southern and Northern Ontario. Both divisions may be regarded as northern districts geographically, culturally, and politically in some contexts.
The 2011 census revealed that the major urban divisions of York, Halton, Peel, and Ottawa had the largest growth. While the heavy industrial divisions of Chatham, Lambton, and Essex, as well as the mostly recreational divisions of Huron and Prince Edward had a decrease in population.
Higher education
Southern Ontario has long been an international destination for higher learning. It houses numerous internationally acclaimed public
universities and colleges amongst its 13
universities
A university () is an educational institution, institution of tertiary education and research which awards academic degrees in several Discipline (academia), academic disciplines. ''University'' is derived from the Latin phrase , which roughly ...
and 20
colleges
A college (Latin: ''collegium'') may be a tertiary education, tertiary educational institution (sometimes awarding academic degree, degrees), part of a collegiate university, an institution offering vocational education, a further educatio ...
. It is also home to numerous private post-secondary institutions.
Culture
Many notable Canadians have been based in Southern Ontario, as it is Canada's most populated area. Toronto is notable for its
multiculturalism
Multiculturalism is the coexistence of multiple cultures. The word is used in sociology, in political philosophy, and colloquially. In sociology and everyday usage, it is usually a synonym for ''Pluralism (political theory), ethnic'' or cultura ...
and cosmopolitan nature: Southern Ontario also features in the literary genre of
Southern Ontario Gothic, a major strand in Canadian literature.
Transportation

Southern Ontario has a highly developed transport system, including many
highways
A highway is any public or private road or other public way on land. It includes not just major roads, but also other public roads and rights of way. In the United States, it is also used as an equivalent term to controlled-access highway, or ...
, airports, ports, trains, and buses. The freeway system in Southern Ontario is referred to as the
King's highways system, or the
400 series highways
The 400-series highways are a network of controlled-access highways in the Canadian province of Ontario, forming a special subset of the provincial highway system. They are analogous to the Interstate Highway System in the United States or th ...
. The freeways are digitally monitored by the
Ministry of Transportation (Ontario) using the
COMPASS-Freeway Traffic Management System With the long-awaited upgrade of Highway 406, all the freeways in Ontario are at least 4 lanes wide, fully controlled with interchanges and divided. The major freeways are
400
__NOTOC__
Year 400 (Roman numerals, CD) was a leap year starting on Sunday of the Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Stilicho and Aurelianus (consul 400), Aurelianus (or, less frequently, year ...
,
401,
402,
403,
404,
405,
406,
407 (Toll),
409,
410,
412,
416,
417,
418,
420,
427,
Don Valley Parkway,
Gardiner Expressway,
Queen Elizabeth Way
The Queen Elizabeth Way (QEW) is a 400-series highways, 400-series highway in the Canadian province of Ontario linking Toronto with the Niagara Peninsula and Buffalo, New York. The highway begins at the Canada–United States border on the Pea ...
,
Queensway,
Lincoln M. Alexander Parkway,
Red Hill Valley Parkway,
Conestoga Parkway, and the
E. C. Row Expressway.
Southern Ontario also has several
border crossings with the United States. The
Ambassador Bridge, unfinished
Gordie Howe International Bridge,
Detroit–Windsor Tunnel, and
Blue Water Bridge connect the region with the
U.S. state of
Michigan
Michigan ( ) is a peninsular U.S. state, state in the Great Lakes region, Great Lakes region of the Upper Midwest, Upper Midwestern United States. It shares water and land boundaries with Minnesota to the northwest, Wisconsin to the west, ...
, while the
Peace Bridge,
Rainbow Bridge,
Whirlpool Rapids Bridge,
Lewiston–Queenston Bridge,
Thousand Islands Bridge,
Ogdensburg–Prescott International Bridge, and
Seaway International Bridge link Southern Ontario with the U.S. state of
New York.
The region has a long history of marine transportation, with hundreds of millions of tonnes of cargo moving along the
Great Lakes
The Great Lakes, also called the Great Lakes of North America, are a series of large interconnected freshwater lakes spanning the Canada–United States border. The five lakes are Lake Superior, Superior, Lake Michigan, Michigan, Lake Huron, H ...
, and
Saint Lawrence Seaway each year. The
Welland Canal
The Welland Canal is a ship canal in Ontario, Canada, and part of the St. Lawrence Seaway and Great Lakes Waterway. The canal traverses the Niagara Peninsula between Port Weller, Ontario, Port Weller on Lake Ontario, and Port Colborne on Lak ...
is a vital part of the
Great Lakes Waterway, allowing ships to avoid
Niagara Falls
Niagara Falls is a group of three waterfalls at the southern end of Niagara Gorge, spanning the Canada–United States border, border between the Provinces and territories of Canada, province of Ontario in Canada and the state of New York (s ...
. The
St. Clair River
The St. Clair River is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed November 7, 2011 river in central North America which flows from Lake Huron into Lake St. Clair, forming part ...
and
Detroit River
The Detroit River is an List of international river borders, international river in North America. The river, which forms part of the border between the U.S. state of Michigan and the Provinces and territories of Canada, Canadian province of Ont ...
are also well travelled rivers between Lake Huron and Lake Erie in the
Windsor,
Sarnia
Sarnia is a city in Lambton County, Ontario, Canada. It had a Canada 2021 Census, 2021 population of 72,047, and is the largest city on Lake Huron. Sarnia is located on the eastern bank of the junction between the Upper and Lower Great Lakes, ...
area. Major regional ports include the
Port of Hamilton and Port of Windsor, with smaller ports in
Oshawa
Oshawa is a city in Ontario, Canada, on the Lake Ontario shoreline. It lies in Southern Ontario, approximately east of downtown Toronto. It is commonly viewed as the eastern anchor of the Greater Toronto Area and of the Golden Horseshoe. It ...
,
Toronto
Toronto ( , locally pronounced or ) is the List of the largest municipalities in Canada by population, most populous city in Canada. It is the capital city of the Provinces and territories of Canada, Canadian province of Ontario. With a p ...
,
Goderich and Sarnia. Southern Ontario also has thousands of other freshwater lakes and rivers, as well as the
Trent-Severn Waterway and
Rideau Canal.
Inter-city train service in the region is provided mainly by
Via Rail
Via Rail Canada Inc. (), operating as Via Rail or Via (stylized as VIA Rail), is a Canadian Crown corporation that operates intercity passenger rail service in Canada.
As of December 2023, Via Rail operates 406 trains per week across eight ...
. The
Greater Toronto area
The Greater Toronto Area, commonly referred to as the GTA, includes the Toronto, City of Toronto and the regional municipality, regional municipalities of Regional Municipality of Durham, Durham, Regional Municipality of Halton, Halton, Regional ...
also has a commuter train system called the
GO Train, which is supplemented by a network of bus services.
There are several major international airports, including the busiest airport in the country,
Toronto Pearson International Airport (ranked 15th busiest worldwide by flights in 2014),
Ottawa Macdonald–Cartier International Airport,
John C. Munro Hamilton International Airport,
London International Airport, and
Region of Waterloo International Airport. Many Southern Ontarians living close to the
Michigan
Michigan ( ) is a peninsular U.S. state, state in the Great Lakes region, Great Lakes region of the Upper Midwest, Upper Midwestern United States. It shares water and land boundaries with Minnesota to the northwest, Wisconsin to the west, ...
or
New York State
New York, also called New York State, is a state in the northeastern United States. Bordered by New England to the east, Canada to the north, and Pennsylvania and New Jersey to the south, its territory extends into both the Atlantic Ocean and ...
borders use either
Detroit Metropolitan Wayne County Airport or
Buffalo Niagara International Airport
Buffalo Niagara International Airport is in Cheektowaga (town), New York, Cheektowaga, New York (state), New York, United States. The airport serves Buffalo, New York and Niagara Falls, New York in the United States, and the southern Golden H ...
as their local airport.
Climate

Southern Ontario has a
humid continental climate
A humid continental climate is a climatic region defined by Russo-German climatologist Wladimir Köppen in 1900, typified by four distinct seasons and large seasonal temperature differences, with warm to hot (and often humid) summers, and cold ...
with four distinct seasons. The average highs in July for the region range between . The average high in January ranges from . The highest recorded temperature in Southern Ontario was with the
humidex. During cold snaps, winter temperatures can occasionally drop below . The climate found over most of southern Ontario falls within the ''Dfb'' and '' Dfa'' climate subtypes, much warmer or milder than the northern part of the province due to lower latitude, presence of bodies of water, and intense urbanization.
Harsh weather is not uncommon in the region. In the summer months, Southern Ontario is susceptible to
tornadoes but far more often, straight line wind damage, hail and localized flooding from severe thunderstorms. Although the majority of tornadoes rarely cause excessive damage, the region is on the periphery of
Tornado Alley
Tornado Alley, also known as Tornado Valley, is a loosely defined location of the central United States and, in the 21st century, Canada where tornadoes are most frequent. The term was first used in 1952 as the title of a research project to st ...
and
(F4) tornadoes touchdown every few decades, causing widespread damage. Southern Ontario also gets
hurricane
A tropical cyclone is a rapidly rotating storm system with a low-pressure area, a closed low-level atmospheric circulation, strong winds, and a spiral arrangement of thunderstorms that produce heavy rain and squalls. Depending on its ...
remnants,
floods
A flood is an overflow of water (list of non-water floods, or rarely other fluids) that submerges land that is usually dry. In the sense of "flowing water", the word may also be applied to the inflow of the tide. Floods are of significant con ...
,
ice storms, heavy
fog,
hail
Hail is a form of solid Precipitation (meteorology), precipitation. It is distinct from ice pellets (American English "sleet"), though the two are often confused. It consists of balls or irregular lumps of ice, each of which is called a hailsto ...
, and
blizzard
A blizzard is a severe Winter storm, snowstorm characterized by strong sustained winds and low visibility, lasting for a prolonged period of time—typically at least three or four hours. A ground blizzard is a weather condition where snow th ...
s.
Small
earthquakes occur in the region. The 5.8
Cornwall–Massena earthquake occurred in 1944 and had a maximum
Mercalli intensity of VII (''Very strong'').
Many tourists visit the area in the autumn months to look at the bright, vibrant colours of
fall foliage.
Southern Ontario has a very different climate from the rest of the country. It is the only area of Canada that has
Carolinian forest.
Many trees, plants, and wildlife in Southern Ontario are not found anywhere else in Canada. Some rare trees in this region include the
tulip tree,
pawpaw fruit tree, and the
cucumber tree. The Carolinian forests of Southern Ontario have in large part been destroyed by development sprawl. Very few original growth areas remain.
The region has the most freshwater beaches in the nation. With relatively warm waters by mid-summer due to the hot and humid summer months with significant coastlines of white sand, the major beaches in the region are visited by millions of tourists every summer. The most popular beaches are
Wasaga Beach,
Grand Bend,
Sauble Beach, and
Sandbanks.
See also
* Subregions in Southern Ontario
**
Central Ontario
**
Eastern Ontario
**
Golden Horseshoe
**
Southwestern Ontario
*
Great Lakes region
The Great Lakes region of Northern America is a binational Canadian– American region centered on the Great Lakes that includes the U.S. states of Illinois, Indiana, Michigan, Minnesota, New York, Ohio, Pennsylvania, and Wisconsin and the Ca ...
*
Great Lakes Megalopolis
Footnotes
References
*''Chapman, L. J. and Putnam, D. F. The Physiography of Southern Ontario. 3rd ed. Toronto: Ontario Ministry of Natural Resources, 1984. (Ontario Geological Survey. Special volume 2) .''
External links
Southern Ontario Tourism
{{Authority control
Geographic regions of Ontario